Luckily, the buffer that the packet is copied into is a fixed length, so there is no concern that a valid packet will overflow the buffer length. This changed the value of the length so that it would be correct for the call to srtp_protect. I changed the length of the hooked memcpy to be passed by reference instead of by value, and then had the library change the length to the length of the logged packet. This required modifying the WhatsApp binary slightly, because the logged packet will usually not be the same size as the packet currently being sent. Then I created a second library that copied the logged packets into the buffer being copied instead of altering it. To replay the packets I added logging to the library, so that each buffer that was altered would also be saved to a file. Assuming that the code in WhatsApp is some variation of that code, the memcpy copies the entire unencrypted packet right before it is encrypted.

The log entries in the WhatsApp binary say that the function being called is transport_send_rtp2 and the PJSIP source only has a function called transport_send_rtp, but it looks similar to the function calling srtp_protect in WhatsApp, in that it has the same number of calls before and after the memcpy. Some log entries before the call contained the file name srtp_transport.c, which exists in the PJSIP repository. There was only one function in the binary that called this function, and called memcpy soon before the call. This led to a log entry emitted by a function that looked like srtp_protect. Since PJSIP uses the open source library libsrtp, I started off by opening the binary in IDA and searching for the string srtp_protect, the name of the function libsrtp uses for encryption. It might happen that you're misunderstanding the filename or extension.PJSIP is open source, so it was easy to identify the PJSIP code in the Android WhatsApp binary (libwhatsapp.so). Definitely, this will help you understand what is MOV file format and how to play MOV files on different gadgets.

You should save a home video as an MP4 file if you ever want to keep it, share it with someone, and are willing to suffer some quality loss. For example, if you want to save a movie in higher quality but don't have much space on your computer, you should just save it as. MOV files are frequently superior in performance and greater in sizeīecause of these distinctions, there are times when one file format is more suited to your needs than the other. It is a global standard and compatible with all gadgets

Whatsapp open mov